WTO与我国建材行业发展的趋势——兼论建材行业人才需求的新变化

本文论述了我国进入世贸组织后,建材行业发展将遇到的机遇与挑战;预测了建材行业的发展趋势及人才需求动向;提出创办材料方面的新专业应充分考虑复合型人才的培养.     

自动喷水灭火系统设计问题探讨

通过对中危险级自动喷洒灭火系统喷头布置形式的研究 ,推导出喷头在矩形、棱形、走道单排布置时的适宜布置间距 ,依据喷头最有利点与最不利点间的压力范围控制管道的压力损失 ,确定配水干管和支管的管径。不宜盲目采用常规推荐的管径     

多节状SiC晶须的合成及在矿冶工程材料中的应用

运用TEM、XRD等分析检测技术对SiCw的形貌结构、长度与直径分布及其应用于复合材料中的特性进行了检测。研究表明：SiCw产品以直晶为主，表面呈多节状，以-SiC为主要晶型，直径为0.2～1.5m,长度为30～200m。此外，作者对SiCw在矿冶工程材料中的应用进行了展望。     

Synthesis and characterization of bifunctional terbium complex-based nanoparticles

Novel bifunctional terbium complex-based nanoparticles were developed using a modified Stber method and a layer-by-layer assembly process. A magnetic core of Fe3O4 nanoparticles was coated with a silica shell to form the first layer. Then a ternary Tb3+ complex (TESPPA-Tb), which acted as a luminescent marker, was covalently bound to the silica surface by stable Si-O-Si bonds. The TESPPA monomer was synthesized by binding pyridine 2,6-dicarboxylic acid to 3-aminopropyltriethoxysilane, which was used as a ligand for coordination with the Tb3+ ions. An outer shell of silica was applied to the nanoparticles to allow for versatility with surface functionalization. The nanoparticles were characterized by X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, ultravioletvisible spectroscopy, vibration sample magnetometer, and photoluminescence spectroscopy. The bifunctional nanoparticles exhibited favorable superparamagnetic behavior and photoluminescence properties of Tb3+. These nanoparticles have potential applications in biolabeling, bioseparation, immunoassays, and pathogenic diagnosis.     

Synthesis of novel superhard materials under ultrahigh pressure

Superhard materials are solids whose Vickers hardness is beyond 40 GPa. They have wide applications in industry such as cutting and polishing tools, wear-resistant coatings. Most preparations of superhard materials are conducted under extreme pressure and temperature conditions, not only for scientific investigations, but also for the practical applications. In this paper, we would introduce the recent progress on the design and preparations of novel superhard materials, mainly on nanopolycrystalline diamond, B–C–N superhard solid solutions, and cubic-Si3N4/diamond nanocomposites prepared under ultrahigh pressure and high temperature（HPHT）, using multi-anvil apparatus based on the hinged-type cubic press. Bulk materials of all these superhard phases have been successfully synthesized and are systematically tested. We emphasize that ultra-HPHT method plays an important role in the scientific research and industrial production of superhard materials. It provides the driving forces for the light elements forming novel superhard phases as well as the way for sintering high-density nanosuperhard materials.     

折边锥形封头计算厚度探讨

对国际ＧＢ１５０－８９《钢制压力容器》所规定的折边锥形封头过渡段厚度、锥体厚度及与封头相接的筒体厚度进行了分析，指出了过渡段厚度偏小，提出了合理的过渡段厚度。     

Understanding of the influence of process parameters on the heat transfer behavior at the metal/die interface in high pressure die casting process

The current paper focuses on the influence of the process parameters on the peak values of the interfacial heat transfer coefficient(IHTC)at metal/die interface during high pressure die casting(HPDC)process.A"step shape"casting and AM50 alloy were used during the experiment.The IHTC was determined by solving the inverse thermal problem based on the measured temperature inside the die.Results show that the initial die surface temperature(IDST,TDI)has a dominant influence while the casting pressure and fast shot velocity have a secondary influence on the IHTC peak values.By curve fitting,it was found that the IHTC peak value(hmax)changes as a function of the IDST in a manner of hmax=e αTγ DI .Such relationship between the IHTC peak value and the IDST can also be found when the casting alloy is ADC12,indicating that this phenomenon is a common characteristic in the HPDC process.     

y+值对翼型气动参数计算精度的影响研究

基于RAE 2822翼型,为了研究粘性底层无量纲参数y+对翼型气动参数计算精度的影响,采用ANSYS ICEM剖分的计算域网格和三维N-S控制方程的有限体积法离散格式,选取SST湍流模型,在不同的y+值下借助ANSYS CFX模块数值计算了该翼型的气动参数,分析了相对误差,绘制了压力系数分布云图。结果表明:过大的y+值导致误差增大;在y+的理论值11.63附近,计算精度变化较小;较小的y+可使精度进一步提高,但过小的y+并不能得到过高的计算精度。y+值对翼型边界不同区域的计算精度影响有所不同,翼型气动参数数值计算时推荐y+取2-4。     

600 t摆杆式起吊船扒杆结构有限元分析

针对大型起吊船受力特点,考虑了风载、横纵倾和惯性载荷等多种恶劣载荷工况,对吊船扒杆进行了结构分析,结构分析结果表明结构满足强度与稳定性要求。     

阳光发电公司汽轮机轴封压力调节系统改造

针对阳光公司轴封压力调节的特点,分析了“同一控制变量不同跟踪值”压力控制方案,解决了系统压力随负荷变化产生的不稳定问题,有效地改善了系统动态调节品质。